Part A
AD8495ARMZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7539 ПКС
- Package
- MSOP-8
- Series
- Интерфейс - интерфейсы датчиков и детекторов
Replacement verdict
Compatible functional replacement candidate
The AD8495ARMZ and AD8497CRMZ are both thermocouple amplifier ICs from the same Analog Devices AD849x family, sharing identical functionality, package footprint, and supply architecture. The AD8497CRMZ is specified for the K-type thermocouple with a wider calibrated temperature range, while the AD8495ARMZ targets J-type thermocouples. Because the core amplifier topology, pinout, and electrical interface are common across the family, the AD8497CRMZ can serve as a functional replacement candidate for the AD8495ARMZ, provided the thermocouple type and calibrated range are validated against the target application.
Thermocouple Type
Validation required
Package Type
High match
Pin Configuration
High match
Calibrated Temperature Range
Validation required
Parts at a glance
Part B
AD8497CRMZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3678 ПКС
- Package
- MSOP-8
- Series
- Интерфейс - интерфейсы датчиков и детекторов
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8495ARMZ | AD8497CRMZ | Why it matters |
|---|---|---|---|
| Function | K-type thermocouple amplifier with cold junction compensation | J-type thermocouple amplifier with cold junction compensation | The thermocouple type determines the temperature range and the voltage-to-temperature transfer function, so the two parts are not directly interchangeable without recalibration. |
| Thermocouple Type | K-type | J-type | Each part is trimmed for the Seebeck coefficient of its specific thermocouple alloy, so using the wrong type produces large temperature errors. |
| Output Voltage Scale | 5 mV/°C | 5 mV/°C | Both provide the same output scaling, which simplifies ADC interface design, but the scaling is only valid for the matching thermocouple type. |
| Temperature Range (linear output) | 0°C to +50°C reference junction; measures up to +1000°C with K-type | 0°C to +50°C reference junction; measures up to +750°C with J-type | The usable measurement span differs because J-type thermocouples have a lower upper temperature limit than K-type, affecting application suitability. |
| Supply Voltage Range | 2.7 V to 18 V (single supply) | 2.7 V to 18 V (single supply) | Identical supply flexibility allows either part to operate from the same rail, easing board-level substitution of the supply design. |
| Supply Current | 180 µA typical | 180 µA typical | Matching quiescent current means power budget and thermal considerations are unchanged when swapping parts. |
| Package | 8-lead MSOP (RMZ) | 8-lead MSOP (RMZ) | Identical footprint and pinout allow a drop-in PCB replacement without layout changes. |
| Operating Temperature Range | −40°C to +125°C | −40°C to +125°C | Same industrial temperature rating means both parts suit the same environmental conditions. |
| Cold Junction Compensation | On-chip, trimmed for K-type | On-chip, trimmed for J-type | The internal CJC is calibrated to the specific thermocouple alloy, so compensation accuracy depends on matching the part to the thermocouple type. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8495ARMZ | AD8497CRMZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Thermocouple Amplifier | Thermocouple Amplifier |
| Input Type | Differential | Differential |
| Output Type | Analog | Analog |
| Supply Current | 250 µA | 250 µA |
| Operating Temperature | 0°C ~ 50°C | 25°C ~ 100°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD8495ARMZ and the AD8497CRMZ?
Both are thermocouple amplifiers with an integrated cold junction compensation, but they are optimized for different thermocouple types. The AD8495ARMZ is trimmed for a Type K thermocouple (5 mV/°C output), while the AD8497CRMZ is trimmed for a Type J thermocouple (also 5 mV/°C output). The AD8495 operates over a −25°C to +400°C range, whereas the AD8497 is specified over a 0°C to +400°C range.
Are the AD8495ARMZ and AD8497CRMZ pin-compatible?
Yes. Both devices are offered in the same 8-lead MSOP (RM) package and share an identical pinout, allowing them to be used interchangeably on the same PCB footprint when the thermocouple type and temperature range requirements are matched.
Can the AD8495ARMZ and AD8497CRMZ be used interchangeably in an existing design?
Not directly without validation. Although they are pin-compatible, the AD8495ARMZ is calibrated for Type K thermocouples and the AD8497CRMZ for Type J thermocouples. Substitution requires confirming that the thermocouple type, cold junction compensation, and specified temperature range of the replacement match the application.
What is the output voltage transfer function of these devices?
Both the AD8495ARMZ and AD8497CRMZ provide a fixed output sensitivity of 5 mV/°C, with the output voltage referenced to the thermocouple temperature. The output is nominally 0 V at 0°C ambient (with the appropriate cold junction compensation), scaling linearly with the measured temperature.
What supply voltage range do the AD8495ARMZ and AD8497CRMZ require?
Both devices operate from a single supply of 2.7 V to 18 V, or from dual supplies of ±2.7 V to ±18 V. This flexibility allows them to interface with a wide range of ADC and signal-chain architectures.
Do the AD8495ARMZ and AD8497CRMZ include cold junction compensation?
Yes. Both devices integrate cold junction compensation circuitry, eliminating the need for an external thermistor or compensation network. The compensation is factory-trimmed for the respective thermocouple type: Type K for the AD8495ARMZ and Type J for the AD8497CRMZ.
What are the operating temperature ranges for the AD8495ARMZ and AD8497CRMZ?
The AD8495ARMZ is specified for operation from −25°C to +400°C, while the AD8497CRMZ is specified from 0°C to +400°C. These ranges reflect the thermocouple measurement ranges for which each device is trimmed and characterized.
What package type do the AD8495ARMZ and AD8497CRMZ use?
Both devices are supplied in an 8-lead MSOP (Mini Small Outline Package), designated by the "RM" suffix in the part number. This package is suitable for space-constrained industrial and instrumentation designs.